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30 Cards in this Set
- Front
- Back
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Raw Score |
The first score obtained in testing; usually represents the number of items correct |
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Norm-Referenced Tests |
Tests designed to compare an individual student's scores with national averages |
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Nominal Scale |
Numerical scale that uses numbers for the purpose of identification |
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Ordinal Scale |
Numerical scale in which numbers are used for ranking |
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Interval Scale |
A scale that uses numbers for ranking in which numerical units are equidistant |
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Ratio Scale |
Numerical scale with the quality of equidistant units and absolute zero |
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Derived Scores |
Scores obtained by using a raw score an expectancy tables
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Standard Scores |
Derived scores that represent equal units; also known as linear scores |
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Descriptive Statistics |
Statistics used to organize and describe data |
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Measures of central tendency |
Statistical methods for observing how data cluster around the mean |
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Normal distribution |
A symmetrical distribution with a single numerical representation for the mean, median and mode |
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Frequency distribution |
Method of determining how many times each score occurs in a set of data |
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Mode |
The most frequently occurring score in a set of scores |
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Binomial Distribution |
A distribution that has two most frequently occuring scores |
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Multimodal distribution |
A distribution with three or more modes |
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Frequency Polygon |
A graphic representation of how often each score occurs in a set of data |
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Median |
The middlemost score in a set of data |
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Mean |
Arithmatic average of a set of data |
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Standard Deviation (SD) |
A unit of measurement that represents the typical amount that a score can be expected to vary from the mean in a given set of data |
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Variability |
Describes how scores vary |
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Measures of dispersion |
Statistical methods for observing how data spread from the mean |
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Variance |
Describes the total amount that a group of scores varies in a set of data |
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Range |
The distance between the highest and lowest scores in a data set |
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Skewed |
Describes a distribution that has either more positively distributed scores or more negatively distributed scores |
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Positively skewed |
Describes a distribution in which more of the scores fall below the mean |
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Negatively skewed |
Describes a distribution in which more of the scores fall above the mean |
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Percentile Ranks |
Scores that express the percentage of students who scored as as well as or lower than given student's score |
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Z-Score |
Derived scires that are expressed in standard deviation units |
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Stanines |
A method of reporting scores that divide data into 9 groups, with scores reported as 1 through 9 with a mean of 5 |
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Deciles |
A method of reporting scores that divides data into 10 groups with each group representing 10% of the obtained scores |
